HP (100 Pack) PS/2 Mouse

Optical tracking - Get precision movement with a tracking system that works through light for less moving parts and greater durability than ball-based mice.
The optical sensor within the HP PS/2 2-Button Optical Scroll Mouse employs a resolution of approximately 800dpi.
Left-handed or right-handed users can enjoy a contoured shape that suits either preference, with a wheel that also functions as a third button.

Hardware compatibility
HP PS/2 Keyboard is compatible with HP Compaq Pro 6300 All-in-One and HP Compaq Elite 8300 All-in-One Business PCs.

HP (100 Pack) PS/2 Mouse, Ambidextrous, Optical, PS/2, 800 DPI, Black